<title>pdb file format</title>
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<h2>pdb file format</h2>
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<H3>Description</H3>

Files with the <a href="pdb.html">.pdb</a> extension are molecular
structure files in the protein databank file format.  The protein
databank file format describes the positions of atoms in a molecular
structure. Coordinates are read from the ATOM and HETATM records,
until the file ends or an ENDMDL record is encountered.
GROMACS programs can read and write a simlation box in the
CRYST1 entry. 
The pdb format can also be used as a trajectory format:
several structures, seperated by ENDMDL, can be read from 
or written to one file.

<p>
<h2>Example</h2>
An pdb file should look like this
<PRE>
ATOM      1  H1  LYS     1      14.260   6.590  34.480  1.00  0.00
ATOM      2  H2  LYS     1      13.760   5.000  34.340  1.00  0.00
ATOM      3  N   LYS     1      14.090   5.850  33.800  1.00  0.00
ATOM      4  H3  LYS     1      14.920   5.560  33.270  1.00  0.00
...
...
</PRE>

<p>
<a href="../tutor/speptide/speptide.pdb.txt">speptide.pdb</a>:
Protein structure file of Ribonuclease A speptide in protein data 
bank file format. 

<p>
Links to descriptions of the pdb format
can be found on the <A HREF="../links.html">Links page</A>.

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